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This was a collection of stories by software geeks, I believe. Two key stories included:
You'd probably have to have the book to get the references but... can't give the ending away.
Searching 'tornado' in ISFDB came up with a possibility:
Infinite Loop: Stories About the Future by the People Creating It : Software Development's Own Anthology of Science Fiction (1994), ed. by Larry Constantine
I edited Infinite Loop. All the stories were by people associated with computer software, mostly programmers. (Out of print but used copies are still available.) Some of those stories, along with the rest of my own short stories, are compiled in Requisite Variety (Gesher Press, 2011).
Both of the current answers suggest Infinite Loop as the correct book.
The tornado story in Infinite Loop is titled "STORMY vs. the Tornadoes" which is available online here (~800 words)
It is about a National Weather Service supercomputer which was told to reduce US tornado fatalities, and is given authorization to spend up to $2,000 a transaction without human approval, and it spent $21 million dollars... in 18,000 transactions. A Senator investigates.
"A supercomputer"
that computer program of yours
"used to solve the problem of tornadoes"
STORMY's answer was immediate:
TO KEEP TORNADOES FROM KILLING PEOPLE.
>!)